chapter 10: circles
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Created by:
alayna_weiss on February 21, 2012
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11 terms
Terms | Definitions |
|---|---|
 circle | the set of all points in a plane that are equidistant form a given point |
| radius | a segment whose endpoints are the center of the circle and a point on the circle |
| diameter | a segment whose endpoints are both on the circle and passes through the center |
| chord | a segment whose endpoints are both on the circle |
| secant | a line that intersects the circle in two points |
| tangent | a line that intersects the circle in one point that is coplanar |
| concentric circles | have the same center and are coplanar |
| common tangent | tangent lines to more than one circle in one plane |
| thm 10-1 | a tangent line is perpendicular to the radius at the point of tangency |
| thm 10-2 | in a plane, if a line is perpendicular to a radius at its endpoint on the circle then the line is tangent to the circle |
| thm 10-3 | tangent segments are congruent |
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